Accession Number : ADA516510


Title :   Positron Annihilation Ratio Spectroscopy (PsARS) Applied to Positronium Formation Studies


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT


Personal Author(s) : Slaughter, Robert C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a516510.pdf


Report Date : Mar 2010


Pagination or Media Count : 152


Abstract : A Positron Annihilation of Radiation Spectrometer (PsARS) was developed and characterized. PsARS spectroscopy as well as digital Positron Annihilation Lifetime Spectroscopy (PALS) was applied to measure positronium formation on gold manoparticles deposited through an evaporative method onto a thin capillary tube. This gold coated capillary tube was designed to be used for positronium lifetime studies in local electric field experiments. High local electric fields can polarize a positron-electron pair, which may result in an extended lifetime of the positron. These fields may be created through the interaction of an external electric field with silver manoparticles deposited onto the surface of gold coated capillary tubes. The capability to control size and distribution of silver manoparticles on such a surface is demonstrated. PsARS analysis of potassium dodecahydrododecaborate (dodecaborate) solutions was also performed to verify positronic dodecaborate species as well as potential positronium quenching.


Descriptors :   *POSITRONIUM , *ANNIHILATION RADIATION , *POSITRONS , *SPECTROSCOPY , QUENCHING , EVAPORATION , POTASSIUM , SPECTROMETERS , CAPILLARY TUBES , ELECTRIC FIELDS , THESES , POLARIZATION , MEASUREMENT , EXTERNAL


Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Nuclear Physics & Elementary Particle Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE